Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23ac1c3633a5924…

MALICIOUS

PDF

68.9 KB Created: 2021-02-21 15:06:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 0f17b73dfd17b2ce9b31c662f6d56b89 SHA-1: 7fc5db11f6b8543bde3315f4614ba2762fe58c8c SHA-256: b23ac1c3633a59247f16c34dedb5bbc6b6d026e01040eedfac8f8b7a313dcead
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspected redirector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to obscure the final malicious destination. No scripts were extracted, but the overall structure and URL patterns are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jacksth.ru/strik?utm_term=brother+pt+h100lb PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446168/normal_5fd7cc0527b02.pdfIn PDF document text
    • http://wotanute.22web.org/35496200060.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/W6hbljg/17316293377.pdfIn PDF document text
    • http://detobusukited.iblogger.org/tizafamawufijabudebowo.pdfIn PDF document text
    • http://rezltml.xyz/speed_of_trust_summary_pptmkmvf.pdfIn PDF document text
    • http://aicberg.net/998933777133pwql.pdfIn PDF document text
    • http://gexifivavipi.iblogger.org/vezalopomudaniwofirog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujefozumuresul.epizy.com/zefub.pdfIn PDF document text
    • https://s3.amazonaws.com/sefabe/46776096779.pdfIn PDF document text
    • http://gikutixutawax.epizy.com/sagulakegivu.pdfIn PDF document text
    • http://dinoxisajuz.rf.gd/65713656676.pdfIn PDF document text
    • http://zapavuvezozetet.epizy.com/bosch_router_edge_guide_lowes.pdfIn PDF document text
    • http://zevovalik.epizy.com/2_step_equations_with_fractions_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kovozenamofox/tagifikuwizewif.pdfIn PDF document text
    • http://bogurivesinoni.rf.gd/telatataxogufixopoxex.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/sig_p229_duty_holster_with_light.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C4 4900 bytes
SHA-256: 2b2f9c5fb7b6ef5d22d86859e06b4f37039f8bf5418e8940af57bf8d05f0ba68
font_01_sfnt_off0000e26d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26D 10960 bytes
SHA-256: dfee6a72f7626622ea562d5f8b3831cb9d72f0b68f7f35dc0f3174f8b355cdc0

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